Date: Thu, 19 Apr 2007 01:02:25 -0700 From: "Howard Su" <howard0su@gmail.com> To: Glen <glen.leeder@nokia.com>, fs@freebsd.org Subject: Re: handle special file type in tmpfs Message-ID: <f126fae00704190102v3ca39538we34160e589cf3d54@mail.gmail.com> In-Reply-To: <4626F339.5040602@nokia.com> References: <4626EA38.6010703@nokia.com> <4626F339.5040602@nokia.com>
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> Glen wrote: > > Hi Howard, > > > > May I ask if you are using the tmpfs port by Rohit Jalan? A link to > > his work can be found on this page: > > http://www.freebsd.org/projects/ideas/ Yes. The ideas page bring me to this working. > > > > I am currently using the BETA3 tmpfs port and have experienced an > > issue with the FIFO support for tmpfs. I believe that this is because > > the tmpfs_fifoops.c specifies an incomplete vnode operations vector > > (vop_vector) for tmpfs. The vop_vector allows you to specify all the > > vnode operations for a particular filesystem. I already fix that in my WIP. you can check the code in the perforce. http://perforce.freebsd.org/depotTreeBrowser.cgi?FSPC=//depot/user/howardsu/truss/sys/fs/tmpfs My working currently based on Beta3. > > > > If you check out ufs/ufs_vnops.c it specifies a global vop vector for > > most file types and then a different vop_vector for FIFO file types. > > Rohit's tmpfs port does a similar thing. I have populated the tmpfs > > vop_vector in this port and FIFO seems to work a better although I > > haven't fully tested it yet. Maybe this information helps you get to > > a solution. You are right. > > > > I am keen to get tmpfs into the Freebsd tree and have been > > communicating with Rohit regarding this. He currently doesn't have > > time to do further improvements and I have offered to help get this > > tmpfs port into Freebsd. I am awaiting a response to this (we only > > started talking last week). > > > > This port has a few outstanding items: > > > > * MP safeness (some locking may be required). I have started testing > > tmpfs on an MP system. Can you try my WIP?(I can send you the patch against -Current) I add some basic locking stuffs. I am glad to work with you together. Now I don't have a MP system to test. > > * Security audit (not sure what's required for this) > > * Quota support, ACL work is pending Do we really need this? What's user scenerio to use Quota or ACL for a TMPFS? I can be conveienced. > > * Two data I/O mechanisms are benchmarked, deciding which one to use > > is still pending You can help. I really help to see you have interesting. It will be better if we can work together. Besides the locking & fifo fixing, I also working on the following tasks: 1. Catch up the main tree changes related FS after Rohit post his patch. 2. Port regression test cases 3. Remove un-named union so that tmpfs can build in a kernel -- -Howard
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